Does the raw/bulk cable for the VDI cable have to be Cat5 or Cat6 cable, or will any high-quality 8 conductor cable work? Do the internal cable wires need to be twisted pairs? I'd like to build my own cables but don't want to use the usual Cat5/6 cable as it all too stiff. I can't find a supplier for the cable like Line 6 uses for this. Any ideas??